Strongly luminescent CuInS2/ZnS core/shell nanoparticles are synthesized using two different methods. One method is the reaction of copper and indium acetate, dodecanethiol, octadecene, in inert atmosphere at 260�C during 1h. In second method, thiourea was employed as source of sulfur. After the formation of the core, temperature was lowered to 240� C and 20 ml of ZnS precursor was added drop by drop. The reaction was continued for additional 30 minutes and finally cooled to room temperature. Ethanol and acetone was added followed by centrifuging for precipitation. ZnS precursor was prepared mixing two aqueous solutions of zinc acetate and sodium diethyldithiocarbamate, and then product of this reaction was dissolved in oleylamine with vigorous stirring. Structural characterization by x-ray diffraction shows the characteristic peaks (112), (204), (220), (132) of CuInS2 nanoparticles and the peaks (112), (110), (132) of CuInS2/ZnS core-shell. Photoluminescence of the core/shell structure reveals emission observed in red and near-IR regions. We observe a decrease in the luminescence emission intensity when we use thiourea as precursor. High resolution transmission electron microscopy (HRTEM) images of CuInS2/ZnS core/shell structures are significantly circular with diameters of approximately 5nm, and have homogeneous particle size distribution.

Influence of ligands in photoluminescence properties of CuInS<sub>2</sub>/ZnS core/shell structures

247th National Meeting (2014)

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Influence of ligands in photoluminescence properties of CuInS2/ZnS core/shell structures

Influence of ligands in photoluminescence properties of CuInS₂/ZnS core/shell structures